Exercise: what’s that?
Before starting to
discuss how exercise affects the physiology of animals, let’s look
at how different scientists have tried to define exercise.
One of the
definitions proposed by
B. J. Whipp is:
is a process which depends upon the transformation of the biochemical
energy of ingested food into mechanical energy of muscle contraction
of exercise proposed by D.R. Jones & D. J. Randall is:
is work performed on the environment by the
two definitions highlight different aspects of what exercise is.
In the first definition the conversion of food into biochemical energy
is the focus whereas in the second it is the muscle work that is the
Both definitions describe the same thing but from two different
angles: fish (as is true of all animals) need energy to be able to
move; in some way, the energy – coming from food – has to be converted
to mechanical movements performed by the muscles.
What does Newton have to say about
exercise, read more about it